x86: quark: Add clrbits, setbits, clrsetbits macros for message port access
On Intel Quark, lots of registers on the message port need be programmed. Add handy clrbits, setbits, clrsetbits macros for message port access. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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